From NBC's Mark Murray
It's the toughest job in the world.
You need to be ready for anything -- especially now, with two wars, oil prices skyrocketing and an economy in crisis.
Harry Truman said it best -- if you can't stand the heat, get out of the kitchen.
Who do you think has what it takes?
I'm Hillary Clinton and I approve this message.
*** UPDATE *** The Obama campaign weighs in with this quote from Bill Clinton in 2004: "Now one of Clinton's Laws of Politics is this: If one candidate's trying to scare you and the other one's trying to get you to think; if one candidate's appealing to your fears and the other one's appealing to your hopes, you better vote for the person who wants you to think and hope. That's the best."